Best Way To Map A Massive SharePoint Folder Structure?

I’m not sure if this is the right subreddit (if not, please let me know where this would fit better).

At my company, our SharePoint contains roughly 21,000 folders/files combined, with some paths going as deep as 13 levels.

As an intern, I was tasked with creating a flowchart that lists all folder names and filenames while showing the hierarchy/path structure.

I was advised to focus on just one root folder (out of ~30 total) for now, but even that single folder contains around 13,000 items.

What management ultimately wants is a visual way to understand:

– what files/folders exist

– whether things are stored in the correct location

– what can be moved or deleted

– how the structure could be reorganized

The reorganization decisions themselves are for management to make, my task is mainly to provide a usable visual representation of the structure.

I’m struggling to figure out the best approach.

So far I’ve:

– tried generating HTML visualizations with AI using file paths

– considered using Microsoft Visio

– considered assigning codenames/IDs to folders with a separate legend for reference

But with 13,000 items, every approach still feels too cluttered and difficult to navigate.

I’m also hesitant to use third-party tools/sites because this involves company information.

Does anyone have suggestions on how to approach this in a practical way?